x xxxx xxxxxx xx xxx xxxxxxx xxxxx \( (x,x) \) xxxxxx xxx xxxxxx xxxx xxxxxxxx \( (x,x) \), \( (x,x) \), \( (x,x) \), xxx \( (x,x) \). xx xxxx xxxx, xx xxxxx xxx xxxx xx, xxxx, xxxx, xx xxxxx, xxxx xxx xxxx xxxxxxxxxx xxxxxxx xxxxxx xxx xxxxxxxxxxx xx xxxxxxxx xxxxx. xxx xxxxxxx xxxxx xxxx xxx xxxx xxxxx xxxxxxx xxx xxxxxxxx xx xxx xxxxxx. xxxx xx xxx xxxxxxxxxxx xxxx xx xxxxx xx x xxxxxxxx xxxx?
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